Can you identify the grass and the disease? This is a warm-season grass, in Southeast Asia, maintained at a mowing height of about 25 mm (1 inch). The average temperature during this season is about 17°C. Answer to be posted in a few days. 

Answer: This is seashore paspalum (Paspalum vaginatum) showing typical symptoms of dollar spot. Seashore paspalum grows most rapidly when average temperatures are more than 25°C. With the temperature at less than the optimum for seashore paspalum growth, but within the optimum range for dollar spot to grow, we can see this type of severe damage.

For some advice about dollar spot control on seashore paspalum in Asia, see this post from the Turf Diseases website:

Suggestions on the Right Maintenance for the Wrong Grass